Title

The "at" daemon must not execute group-writable or world-writable programs. (Cat II impact)

Discussion

If the "at" facility executes world-writable or group-writable programs, it is possible for the programs to be accidentally or maliciously changed or replaced without the owner's intent or knowledge. This would cause a system security breach.

Check Content

List the "at" jobs on the system. Procedure: # ls -la /var/spool/cron/atjobs For each "at" job file, determine which programs are executed. Procedure: # more <at job file> Check each program executed by "at" for group- or world-writable permissions. Procedure: # ls -la <at program file> If "at" executes group- or world-writable programs, this is a finding.

Fix Text

Remove group-write and world-write permissions from files executed by "at" jobs. Procedure: # chmod go-w <file>

Additional Identifiers

Rule ID: SV-227769r603266_rule

Vulnerability ID: V-227769

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.